The Grundig AN200 is a passive, fully adjustable indoor antenna for the AM broadcast band. This inductive coupling makes it easy to use with most portables that have an AM Ferrite bar antenna. Simply placing this antenna near the radio will improve reception! Just adjust the AN200 tuning knob for maximum gain. There is also an output jack for a "wired" connection to radios with AM antenna terminals. The supplied cable has a three conductor 3.5mm plug at one end bare wires at the other end.